Stone-dressing machine



J. MANN. STONE DRESSING MACHINE.

Patented June 30, I885.

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(No Model.)

III V E q LE1,

NrTnD- STATE-s JONATHAN MANN, OF MILTON, MASSACHUSETTS.

STONE-DRESSING MACHINE.

SPECIFICATION forming partof Letters Patent No. 320,942, dated June 30, 1885.

Application filed January, 1885.

To aZZ whom, it may concern..-

Be it known that I, JONATHAN MANN, of Milton, county of Norfolk, State of Massachusetts, have invented an Improvement in Stone- Dressing Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

, My invent-ion relates to a stone-dressing machine for reducing the rough sides of a stone as it comes from the quarry .to a plane smooth surface.

The machine comprises, in its construction, a bed or carriage for supporting the stone,and feeding or moving the same toward the cutters, which act on its surface, and a number of revolving cutter-carrying heads provided with rotary sharp-edged cutting-disks, the said cutter-heads being arranged to act upon three sides of the stone, so that three surfaces may be dressed or cut at the proper angle with relation to one another, with but one operation of placing the stone on the bed and adjusting the cutter-heads with relation thereto, substantially as hereinafter particularly set forth and claimed.

Figure 1 is apartial frontelevation of a stone dressing machine embodying this invention; Fig.2, a front elevation of one of the cutterheads, which acts upon the side of the stone; Fig. 3, a sectional detailshowing the means by which the'disk-cutt-eris connected with the head and adjusted with relation thereto; Fig. 4, adetail showing the bushing-cutter and its arm; Fig. 5, a diagram illustrating the position of the cutters with relation to one another, and tFig. 6 is an elevation of one of the side cuters.

The main frame-work a, and the cross-head b for the head 0 for the cutters that act upon the upper face of the stone, and the bed or carriage d, movable on guides e by feed mechanism shown as consisting of a rack, f, pinion f, gearing f and pulleys f, may be of any suitable or usual construction.

The cutter-heads 9 (see Fig. 2) each act upon the sides of the stone, and are fastened upon shafts g, rotating in bearings 9 and being longitudinally adjustable therein, a portion of the said shaft being threaded, as shown at and provided with nuts 9, engaging the sides of the bearings 9 and preventing longitudi;

(No model.)

nal movement of the said shaft after it has once been adjusted. The said shaft has splined upon it a gear, 9 meshing with apinion, 9 on the shaft 9 provided with an actuating-pulley, g", the said shaft 9 turning in bearings g".

The cutter heads 9 are each provided with a series of arms, h, (see Figs. 2 and 3,) having sockets h to receive the shanks i of the cutter-holders i, in which the shanks of the cutscrews being fastened in lugs 73, connected with the socket-pieces z" of the cutter-shanks. The shanks i of the cut-terholders are also capable of angular or oscillating adjustment in the arms h, and are preferably adjusted by means of wedges m, inserted between the said shanks and the inner walls of the socket, as shown in Fig. 3, thus holding the shank securely when properly adjusted; but screws might be used to effect the angular adjustment, as shown at m.

In operation the cutters are setwith relation to the axis of rotation of the cutter-head, so that they move in different paths with relation to the stone, as shown in Figs. 2 and 5, one or two of the cutters, as It, being farther from the axis of the cutter-head than the rest,

or moving in the largest circle, and the succeeding cutters k k, &c., being each slightly nearer the axis than the preceding one of the series. The cutter is moving in the largest circle projects least toward the surface of the stone, which is indicated by the dotted line S, Fig. 5, and each succeeding cutter k It projects slightly farther than the preceding one of the series, so that when the stone in its feeding movement arrives at the cutters, the cutter k moving in the largest circle will cut to a slight depth into the surface of the stone, and each succeeding cutter will act upon the portion of the stone that has been cut by the preceding one until the last one of the series has cut the stone to the depth desired,

having removed all the irregularities and reduced it to a plane surface. This arrangement distributes the work equally among the different cutters, and, if desired, the said cutters may be arranged in two or more series instead of the entire number forming one series, so that the surface of the stone is acted upon in a given plane only once at each rotation of the cutter-head. In addition to the cutters 70 70 &c., which are intended to remove a considerable amount from the block of stone, the cutter-heads g are provided with one or more bushing or finishing cutters, at, having a series of fine cutting-edges which act upon the surface produced by the series of cutters 70 k -&c., pulverizing the minor projections or irregularities of the said surface, and thus leaving the said surface smooth or with a fine finish. Such finishing operation has heretofore usually been done in another ma chine, thus involving the expense of constructing a separate machine and requiring additional space, which objections are removed by the present invention.

The bushing-cutter is adjustable radially on its supporting-arm h", (see Fig. 4,) the bearing portion of the said cutter having threaded stems 01 extending through a slot, h in the said arm, and being fastened by nuts n at either side of the said arm, by means of which the amount of projection of the said bushingcutter from the cutter-head toward the stone may also be adjusted.

Either one or both of the side cutter-heads may be used independently of the cutter-head that acts on the upper surface of the stone, and the side cutters may be mounted on frame-work independent of the main frame-work of the machine, as shown in Fig. 6, so that they may be moved about from place to place, and set up in connection with any machine having a movable carriage for presenting the stone to the cutters.

If'desired, the bushing-cutter may be set back so far as not to act on the surface of the stone, in case it is desired to leave the stone with'a surface such as produced by the diskcutters.

The duplication of the cutter-heads may be made in this machine after the manner, for example, of the machine shown in Mann and Adams case, Serial No. 134, 951, allowed April 8, 1885.

I claim- 1. In a stone-dressing machine, the combination, with a cutter-head having arms h, provided with sockets 72, of cutters rotatable in holders '5, having shanks 13, secured in said sockets, and screws 77, and nuts engaging ears h, on the arms, and lugs on the holders to adjust such holderslongitudinally in the sockets, and wedges m, or their described equivalent for adjusting the holders at an angle to their sockets, substantially as and for the purpose described.

2. In a stone-dressing machine, the combination, with the cutter-head provided with rotary cuttingdisks, of a bushing-cutter, n, adjustably secured in a slotted arm of such cutter-head by screw-bolt n, and nuts n" 11', substantially as described.

In testimony whereof Ihave signed my name to this specification in the presenceoftwosubscribing witnesses.

JONA. MANN. Witnesses:

Jos'. P. LIVERMORE, W. H. SIGSTON. 

